Who should I trust ?

I am 13 years old and me and my boyfriend have been dating for about 8 months . We’re still going stronng and everything .. but one day .. One of my so called “best friends” Rebecca decided that she was going to pull a prank on me . We were talking on msn , normally .. and all of a sudden she jumps and says “brb , gotta get the phone” so I was like. k . she came back about a minute later and said , “mara , I have horrible news” I got nervous and everything .. and then she said “mara .. andrew (myboyfriend) just called and said ‘ tell mara im sorry but its over. ‘ “ at first I didnt believe her .. but then she started to get really serious and everything .. and so I started crying .. I cryed for about 3 hours . then she finnaly told me that she was kidding and that andrew never called and he never said any of that . so obviously .. I got really mad at her , and I spazzed at her for almost ruining my relationship . then she asked me “wtf . how did I almost ruin your relationship ?” and I said to her “well , I would have believed you , beacuse you wouldnt have told me .. cause I know you .. and I would have cryed all night .. and then I would have gone to school tmrrw .. and been crying all day and I would have been mad at andrew , and then obviously hed dump me or get mad at me too .. and then my relationship would be over,” so I was spazzing and swearing at her .. and then after about another 2 hours , she was trying to appologize.. so after a lot of apologizing .. I finially said it was okay . I havent truly forgiven her yet though , and I dont really think I ever will .. beacuse really .. why would she do that to her best friend ? she knows how much I love andrew . thats just not something you should do to people . she also spreads romours and stuff that me and andrew make out and stuff .. (which we dont) so shes kind of a backstabber.

so im just wondering wether you think I should still be really mad at her , or no ?